Cough is one of the most common ailments and can last for a few days to years, in some cases. People, irrespective of age and sex, experience cough and it can be irritating and disturbing when it keeps coming back. Normal coughing is essential at times, for getting rid of mucus and other particles, thus keeping the airways and throat clear. However, a prolonged and severe cough may be a sign of an underlying disease or disorder. The most irritating type is the dry, tickling cough.